ZDNET Offers 95°F No-AC Heat Survival Tips as Europe Temperatures Hit 119.1°F

Q: Why might turning on a standard fan during a severe heatwave actually put your health at greater risk?

During a severe heatwave, a standard fan can raise health risks because it does not cool the air; it only moves it. When indoor temperatures climb into the upper 90s Fahrenheit or, by some public health guidance, above 90°F depending on humidity, the fan may blow air that is as hot as or hotter than the skin. Instead of helping the body shed heat, that airflow can add heat to the body and increase core temperature. That is why experts warn that fans can create a false sense of relief in extreme heat. They may still feel comfortable, but the body can continue overheating, especially if someone is dehydrated, elderly, ill, taking certain medications, or unable to sweat effectively. The added heat load can speed dehydration and increase the risk of heat exhaustion and, in severe cases, heat stroke. Health agencies including the CDC advise using fans only when indoor temperatures are below about 90°F, while other experts and the WHO place the danger point closer to 95°F or higher depending on conditions. The key factor is whether the fan is helping sweat evaporate or simply pushing very hot air over the body. In extreme heat, safer strategies are to keep sun out during the day, ventilate at night when it cools down, wet the skin or use cold damp towels, drink fluids steadily, and go to an air-conditioned public place if home temperatures remain dangerously high.

Q: Why is the old rule about completely avoiding coffee during extreme heat no longer considered accurate by experts?

Experts no longer say people must completely avoid coffee in extreme heat because newer research shows moderate caffeine intake does not usually cause meaningful dehydration. The old advice came from caffeine’s mild diuretic effect, meaning it can make people urinate a bit more. But specialists now say that effect is often overstated, especially in people who regularly drink coffee and have some tolerance to caffeine. Coffee and tea are mostly water, so they still add to total fluid intake rather than automatically drying someone out. That is why the heat guidance in the article says caffeine is acceptable in moderation. Recent dietetic and medical guidance similarly says coffee and tea can count toward hydration for most healthy adults. The bigger risk is not a normal morning coffee, but excessive caffeine or relying on caffeinated drinks instead of drinking enough fluids overall. In practical terms, water remains the best choice during a heatwave, and people should drink steadily through the day rather than waiting until they feel thirsty. But having coffee is not considered automatically dangerous or dehydrating by itself. Experts are more concerned about heavy caffeine intake, alcohol excess, prolonged heat exposure, and signs of dehydration such as dark urine, dizziness, headache, and reduced urination.

1 articles · Updated · ZDNet · Aug 7

95°F is the key threshold in ZDNET’s latest heat guide: it says fans stop helping much once air temperatures climb that high, making heat-blocking measures more important than air circulation alone.
The article’s main advice is to keep homes cooler by shutting blinds on sun-facing windows, venting at night, and using reflective or blackout coverings—ideally outside windows—to stop heat entering in the first place.
For personal cooling, ZDNET recommends loose light clothing, hats, water misting, cold towels on pulse points, steady hydration, and pocket fans, including one model with a thermoelectric cooling plate for skin contact.
The guidance comes as 2026 heatwaves persist across regions, with U.S. desert basins reaching 115 to 120°F, the UK peaking at 99.9°F, France at 111.7°F, and Sicily at 119.1°F.
ZDNET also flags heat exhaustion and heat stroke symptoms, urging people to seek cool spaces such as libraries or cafés and call emergency services immediately for suspected heat stroke.